The e-mail scams have a subject line related to the swine flu and typically contain either a link to a phishing Web site or an attachment that contains malicious code, the US-CERT said in an advisory.

One scam features a malicious Adobe PDF document titled "Swine influenza frequently asked questions.pdf," according to Symantec. The malicious PDF file has been recognized as "Bloodhound.Exploit.6" and it drops malicious InfoStealer code onto the victim's computer, the company said.